chore: fix tests and simplify CI build

.drone.yml

@@ -4,11 +4,6 @@ type: docker
 name: default
 
 steps:
-- name: cargo check
-  image: rust:1.49
-  commands:
-  - cargo check --verbose --all
-
 - name: cargo test
   image: rust:1.49
   commands: 

src/instruction.rs

@@ -2162,15 +2162,15 @@ mod tests {
 
     #[test]
     fn cycle_add_works() {
-        let lhs: Cycles = Cycles::new(0);
-        let rhs: Cycles = Cycles::new(0);
+        let lhs: Cycles = Cycles::new(5);
+        let rhs: Cycles = Cycles::new(4);
 
         assert_eq!(Cycles::new(9), rhs + lhs);
     }
 
     #[test]
     fn cycle_add_assign_works() {
-        let mut cycles: Cycles = Cycles::new(0);
+        let mut cycles: Cycles = Cycles::new(5);
         cycles += 5;
 
         assert_eq!(Cycles::new(10), cycles);